Shin Na Ra, a woman who is almost thirty welcomes her boyfriend of ten years back from his business trip. During their dinner, he tells her that he not only had an affair but fell in love with another woman. Thus their relationship is no more. To make herself feel better, Na Ra drinks a large amount of alcohol and unknowingly dropped the ring her ex-boyfriend gave her into a random stranger’s cup. The stranger, In-Jae, drinks the shot without seeing the ring and both of them end up in the hospital.